Appliance for machine tapping or screwing operations



June 26, 1945 V J A D W 2,378,967

APPLIANCE FOR MACHINE TAPPING OR SGREWING OPERATIONS Filed Jan. 12, 1944 3 Sheets-Sheet 1 2,378,967 A-PPLi IANCHFOR MACHINE IAPPING OR SQREWING OPERATIONS M June 26, 1945. H. J. ANDREW Filed Jan. 12, 1944 5 Sheets-Sheet 2 June 26, 1945. H. J. ANDRE W 2,378,967

APPLIANCE FOR MACHINE I'APPING OR SGREWING OPERATIONS Filed Jan. 12, 1944 3Sheets-Sheet 5 2,312,376 and of ,rial No. 456,075.

drawings:

Patented June 26, 1945 l APPLiANCE Fon MACHINE, APPING on scnnwmo OPERATIONS m Harry Jones Andrew, Oldham, England insta tiate 12, 1944, Serial No. 518,015 r a In Great Britain February 10, 1943 V l i 4 Claims. 7 (01.74- 3.06)

This invention relatestoappliances for the machine tapping or screwing of; articles, such appliances being of the type in which the drive tothe tool incorporates meansforperiodically reversing the drive so as to break up the metal removed during the tapping operation and therefore obviate damage thereby to the threads being produced orbreakage of taps. 'Examples of suchappliances are described and claimed in the specifications of my Patents Nos.2,296,892 and -The objects of the present invention are to remy co-pending application Seduce the diameter of the case containing the mechanism, to give a better balance to the mechanism, and when a required to provide means :whereby a large diameter sliding terminal shaft maybe employed where it is desired to incorpo rate the device in the head of the present type of tapping machine. i a

The invention comprises, in combination, a revolving driving framatwo spindles secured in "said frameparallel with its axis, a wheel upon one of said spindles driven from a fixed sun wheel co-axial with the frame, a wheel upon one -of said spindles driving a shaft coaxial with i the frame,and meanson said spindles for impa'rting a back and forth movement which is progressively advancing in one direction from one of said wheels to the other. a p

The invention further comprises, in combination, a fixed case a driving shaft journalled in said case, a sun wheel disposed around said driving shaft and fixed to the case; a driven shaft journalled in said case co-axial with the driving shaft and at the opposite side of the case to the t Figure 1 is a sectional elevation and Figure?) a sectional plan on the line 2--2 of Figure 1 illustrating one form of my improved drive to a tapping tool.

Figure 3 is a view similar to Figure 1 but show ing cranks and a connecting rod in place of elliptical wheels for giving the desiredback and forth movement to the tapping tool.

Figure 4 is a sectional elevation on the line 4-p-4 of Figure 5, Figure 5 a sectional plan view on the line 5-5 of Figure 4 and Figure 6 a sectional elevation on the line 6-6 of Figure 5 illustrating a modified form of the improved drive.

Figure 7 is a view similar to Figure 5 but show ing. the use of cranks and a connecting rod in place of elliptical gears in the construction in Fi ures 4, 5 andfi. p p r In Figures 1 and 2, the case a is stationary and shown [the shaft b is journalled in the top of the case and is power driven. "The bracket 0 may be used to clamp the case to any fixture. Secured upon a fixed sleeve d around the shaft b 15 3. gear wheel (1 The shaft 1) revolves a frame comprising an upper member e'and a lower member I interconnectedv by pillars g. Between the said upperandlower members extend two fixed spindles h and z with bearing sleeves 7' and k respeclatter, and a gear train comprising duplex wheels on each of the spindles in the frame for driving the driven shaft from said sun wheel, some of said wheels being of elliptical form.

The invention further comprises, in combination, a fixed case, a driving shaft journalled in said case, a sun wheel disposed around said driving shaft and fixed to the case, a driven shaft journalled in said case co-axial with the driving shaft and at the opposite side of the case to the latter, a planetary wheel upon one spindle driven by the fixed sun wheel as the frame revolves,

a planetary wheel upon the'other spindle driving 1 the driven shaft, and cranks and connecting rods imparting back and forth movements to the latter planetary wheel from the former planetary wheel.

Referring to the accompanying explanatory tively thereon, upon which revolve gear wheels to be now described. A short shaft m is journalled in the upper member e and carries at one end a wheel n meshing with the fixed gearwheel d and at the other end a wheelo meshing with the wheel 10 which forms partof a duplex wheel p, q revolving freely on the sleeve It on the spin dle i. The wheel q is an elliptical gear wheel which meshes with a similar elliptical gear wheel 1' which also forms part of a duplex wheel 1', 8 revolving about the sleeve 7' on the spindle h. The wheel 8 is an elliptical wheel and it meshes with a similar elliptical wheel t which for'ms part of a duplex wheel t, u revolving on the sleeve is on the spindle i. r The wheel u is an elliptical wheel and it meshes with the elliptical wheel 0 which is part of a duplex wheel 22, w revolving on the sleeve 7 on the spindle h. The wheel to is a concentric wheel and it gears with a similar wheel a: on the shaft y to whichis secured the chuck e which holds the tapping tool being driven by the gearing. As the shaft b rotates the frame e f, the gear train mounted therein revolves the chuck a but gives to it a back and forth circular movement with a progression forward.

The construction shown in Figure 3 resembles that shown in Figures 1 and 2 except that two cranks 8 and 9 time connecting rod l0 serve to give the back and forth movements instead of the elliptical gear wheels of Figures 1 and 2. r In Figure 3, the case H is fixed and the shaft l2 rotates the frame comprising the upper and lower members I3 and i4 interconnected by pillars. There are two shafts l5 and I6 extending between and journalled in the frame members t3 and I4. The shaft l5 has the gear Wheel 11 thereon which mesheswith thefixed gear whee'l l8: As the frame revolves, the rotation of the shaft I5 causes,

through the crank 8 in the shaft I5, the connecting rod land the crank 9 in the shaft It, a back and forth circular and not, a complete rotary motion, to be imparted to the shaft I6 and to the gear wheel 19 thereon. The latter wheel gears with the wheel 20 on the shaft 2| and is directly driven by belt or'the like, the frame in the example illustrated being in the form of a pulley. The gearing on the spindles is similar to that in Figure 1 but in the present case the central spindle, 26 is" the drivenspindle being also axially movable and splined in the wheel 3|. Around it at one end is a fixed sleeve 21 having gear teeth thereon which mesh with an idler wheel 28 (in order to give the correct final directionof rotation from the mechanism); The latter wheel meshes with the wheel 29 which forms part of a duplex Wheel 29,v 30, the wheel The said duplex 30 being an elliptical wheel. 7 wheel revolves freely on the spindle 24. The drive from the wheel 30 to the 'wheelBl on the central shaft 26 is by the duplex wheel 32, 33 (both elliptical wheels) on the spindle 25, the duplex wheel 34, 35 (both elliptical Wheels) onthe spindle 24, and the duplexwheel 36,3! (36 only of which is elliptical) on the spindle 25.

The drivefrom the shaft 26 which is a back and forth drive with a progressivemovement in one direction is taken by pulley, gear wheel or the like fixed on the shaft; or by fitting a chuck, carrying the tapping or other tool directly on the shaft.

The arrangementshown in Figure '7, utilises but the back and forth movement for driving a gear-4| wheel fixed on the central axially movable shaft 42 from a'fixed gear wheel 43 is obtained by gearwheels 44 and 45 on the spindles 39 and and cranks '46 and 41 coupled to the v wheels 44 and 45, and a connecting rod 48 exactly as illustrated in Figure 3. The crank 46 makes complete rotary movements but the crank 41 "makes back and forth movernentsmnly. The. frame,38s may form part of. a twocone clutch as used in normal tapping machines.

" What Iclaim is: 1. A mechanism of the type specified for use in the machinetapping or screwing of articles, comprising in combination, a revolving driving frame, two spindles secured in said frame parco-axial with the.

allel with its axis, a wheel upon one of said spindles driven from a fixed sun wheel co-axial with the frame, a wheel upon one of said spindles driving. ashaft co-axial with the frame, and means on said spindles for imparting a back and forth circular movement which is progressively advancing in one direction from one of said wheels to the other. r W

' 2. A mechanism as claimed 'inclairn 1, furthercomprising in combination, a fixed case, a drive ing shaft journalled in said case, a sun wheel disposed around said driving shaft and fixed tov the case,- a-drive'n shaft journalled in said case driving shaft and at the opposite side ofthe case to the latter, and a gear train comprising duplex wheels on each of the spindles in the form for driving the driven shaft from said sun wheelysome of said Wh'eelsbeing of elliptical form'.

'3. A mechanism as claimed in claiml, further comprising, in combination, a fixed case, a'driv the frame 38 as a driving pulley, the spindles 39 and 40 being directly mounted in the pulley as in the construction shown in Figures 4, Sand 6 ing shaftfjournalled in said "case, a sun wheel disposed'around said driving shaftand fixed to s the case, a driven shaft journ'alled in said case co-axial with the driving shaft and at the opposite side of the case to the latter, a planetary wheel upon one spindle driven by the fixed sun wheelas the frame revolves, a planetary wheel upon the other spindle driving the driven'shaft,

and cranks and connecting rods imparting back and forth movements to' the latter planetary wheel from the former planetary wheel. 7

4. In a mechanism as'claimed in claim 1,the arrangement in which the frame revolves and constitutes a driven pulley or wheel;

HARRY JONES ANDREW. 

